Concept:In semiconductors, heating provides energy to break covalent bonds, increasing the number of free charge carriers. This lowers resistance.
Explanation:Resistance depends on the availability of free electrons for conduction.
At normal temperature, semiconductors have very few free electrons.
When heated, electrons gain energy and break free from bonds, creating both free electrons and holes.
More charge carriers means higher conductivity, so resistance decreases.
This is opposite to conductors, where heating increases lattice vibrations and resistance.
Answer:B. decreases